How to change [1,2,3,4] to '1234' using python

Question

How to convert a list intto a single line, for example:

[1, 2, 3, 4]becomes '1234'
[10, 11, 12, 13]becomes'10111213'

... etc.

Answer 1

''.join(map(str, [1,2,3,4] ))

• map(str, array)equivalent [str(x) for x in array], therefore map(str, [1,2,3,4])returns ['1', '2', '3', '4'].

• s.join(a)combines all the elements in a sequence ausing a string s, for example,

  >>> ','.join(['foo', 'bar', '', 'baz'])
  'foo,bar,,baz'
  

  Please note that .joincan only join sequences of lines. It will not call strautomatically.

  >>> ''.join([1,2,3,4])
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: sequence item 0: expected string, int found
  

  Therefore, first you need to first mapall the elements in a row.

Answer 2

''.join(str(i) for i in [1,2,3,4])